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Simplifying 84 = -2(5a + -2) Reorder the terms: 84 = -2(-2 + 5a) 84 = (-2 * -2 + 5a * -2) 84 = (4 + -10a) Solving 84 = 4 + -10a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '10a' to each side of the equation. 84 + 10a = 4 + -10a + 10a Combine like terms: -10a + 10a = 0 84 + 10a = 4 + 0 84 + 10a = 4 Add '-84' to each side of the equation. 84 + -84 + 10a = 4 + -84 Combine like terms: 84 + -84 = 0 0 + 10a = 4 + -84 10a = 4 + -84 Combine like terms: 4 + -84 = -80 10a = -80 Divide each side by '10'. a = -8 Simplifying a = -8
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